$ git clone -n https://src.fedoraproject.org/rpms/rust-serde_ignored.git /var/lib/mock/f40-build-2643368-66485/root/chroot_tmpdir/scmroot/rust-serde_ignored
Cloning into '/var/lib/mock/f40-build-2643368-66485/root/chroot_tmpdir/scmroot/rust-serde_ignored'...
$ git fetch origin a49a9701517dfbfc56c18082bbdc9f871e5295f1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-serde_ignored
 * [new ref]         a49a9701517dfbfc56c18082bbdc9f871e5295f1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a49a970 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild